Mixer



NOV- 5, 1940 o. M. KNODE ETAL n l 22211684 MIXER l I l Filed May 24,V1959 e sheets-sheet;

. ATTORNEY NQ 5, 1940 -o. M. KNoDE ETAL' v K 2,220,684

MIXER Filed May 24,' 1959 sl shveets-shet 2 'A froze/v51 Nov. 5, 1940.M. KNO'DE ETA'L MIXER s shets-sneef s Filed Hay 24, 1939 ENTOR's RNE Y;

Nov. 5,

o. M. KNODEv ETAL MIXER Filed May v24, 1939 e sheets-sheet 4 0. M. KNODEETAL MIXER Filed May 24. 1939 6 Sheets-Sheet 6 aun/5 M. .eA/aos JOSEPHBESAL u FLOYD M. OMHN A T'oR/VEY? r Patented Nom-5, i949 a corporationoi? iiiiiicis Application Nay 2d, 1939, Serial No. 275,342

3 Claims.

This invention relates to mixers forthe preparation of compositeslurries containing cementitious materials, such as calcined gypsum.

In the copending application of Oliver M.

` Knode, Serial No. 247,232, iiled December 22,

, l outer ball race is provided with a scraper to clean off the quicksetting gypsum, but this scraper is apt to be fouled with set gypsum andbroken ol. Furthermore the. ball race of said mixer overhangs the ballsaround the outer periphery so A that no vertical movement of the ballsis permitted under the impact .of the mixer teeth.

An object of this invention, therefore, is to provide a mixer whichrequires only one drive motor for operating both mixing units.

Another object of the inventionv is to provide a mixer which may beconstructed at lower cost. A `further object of the invention is toprovide a mixer in which noscraper is needed over the outer ball race asthe cover is kept clean by vertical wiping movements .of the balls.

A still further object of the invention is to provide a mixer and mixingmethod in which the balls move vertically through impact with the mixerteeth, thus providing a more thorough mixing action; also to improvemixers and mixing methods in other respects hereinafter specified andclaimed.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in WhlCh Fig. l is a side elevation of aA gypsumboard machine equipped with our improved mixer,

Fig. 2 is a sectional elevation through the board machine taken on line2--2 of Fig. l, Fig. 3 is a central sectional elevation through themixer,

Fig. 4 is a sectional plan view of the mixer taken on lined-ll of Fig.3,

Fig. 5 is a sectional plan view through the mixer with balls removed andtaken on line 5 5 of Fig. 3, Fig. 6 is a sectional plan view throughthe-mixer taken on line 6-6 of Fig. 3. Fig. 'I is an enlarged plan viewof one of the mixer discharge gates,

Fig. 8 is an enlarged sectional elevation through the mixer taken online @-3 or" Fig. 7, and

Fig. 9 is a sectional elevation through a disfcharge gate taken on line9 3 of Fig. 7.

Referring to the drawings by numerals, a main drive shaft is rotatablymounted with axis vertical in suitable bearings I6, ll, t3 and i3, athrust bearing 20 being arranged to support the bottom end of said shaftI5. A pulley 2l is secured near the upper end of shaft I 5 and isconnected by belts 22 to a motor pulley 23 mounted on a drivel motor 26.The thrust bearing 23 is secured in the center of a mixer bowl 2t by aretainer cap 2l having a bottom plug 28 for retaining grease, 15 saidcap having threads 29 for engaging the bowl Y 26. A mixing rotor disc 30is provided with a central opening 3| and a hub 3 2 is secured on shaftI5 by a, lock nut 33, said hub ,32 having an outstanding annular flange3d to which disc 30 2d is secured by bolts 35. Upstanding mixing pins 3lare secured to-the upper face of disc 3@ and cooperate with fixed pins38 which are secured to and extend downwardly from a mixer cover 39. Afrusta-conical guard Ml extends about the shaft I5 and seats in anannular recess 4l formed in the top of cover 33.` An annular wearingplate 42 is secured to the upper surface of a slow speed rotor plate 43and a downwardly extending annular pad 4t is formed about the 30 lowerface of disc 30 to slidably engage the ring d2. An internal hub 45 onthe inside of rotor plate 43 engages about the bearings It and i3 sothat the plate 43 can rotate independently of the shaft I5 and disc 30.An annular flange di 35 is formed on the upper surface of plate 33 toform a seal with the pad dll. A u

The outer periphery of rotor plate t3 is proz vided with a downwardlyextending lannular flange 49 to the inside of which an internal gear it50 is attached by bolts 5|. In order to cause the 'rotation of rotorplate 43 from-the shaft i3, a

pinion 52 is secured to the s'haft I8 below the hub 45. Three pinions53, 5t and 55 are rotat=I ably mounted on studs 56 which are secured to45 plate 2G by nuts 51, said pinions being arranged concentrically aboutthe pinion 52 and meshing therewith to produce balanced forces. Threepinions 58, 59 and 60- are rotatably mounted on 'studs 6l which aresecured to fplate 2t by nuts 50 52, said pinions meshing with thepinions 53, 54 and 55 respectively, and with the gear 50. When the shaftI5 rotates in a clockwise direction (Fig.

tion. Upstanding stiiening ribs 64 are formed on the plate 29 adjacentthe various pinions so as to leave openings 65 between said ribs toprevent the building up of material around said pinions. A wearing plate86 is secured to the plate 28 under the flange 49, and an annular toothring 91 is secured to ange 9 by screws 68. Mixing teeth 99 extendoutwardly from the ring 91 and support a plurality of senil-solid rubberballs 1li. An annular ball race ring 1| is secured to an annularupstanding ange 12 formed around the periphery of the plate 28, and asec'- tional removable annular cover 13 extends over .the flange 12. Aninner ring 14 is supported between covers 13 and 39, the inner surfacesof 4ring 18, cover 19 and ball race 1| forming a mixing space 15 whichis elliptical in cross section with its major cross-sectional axisdisposed ver- ,18 through the cover 39.

tically. The impact of the teeth 69 on balls 'i8 causes said balls tobounce upwardly and then inwardly to keep the 'inner surface of thespace 'l5 wiped clean and preventing the formation of set gypsum on saidsurface Without the necessity of scrapers. The bouncing of the ballsalso aids materially in the thorough mixing of the slurry.

In order to supply the ingredients for the slurry mixture, we provide ascrew conveyor 11 which conveys calcined gypsum from a bin not shown anddelivers said calcined gypsum through a pipe A scraper 19 rotates insideof pipe 18,-being driven by bevel gears 88 and 8|, the latter gear beingmounted on a shaft 82 having a sprocket wheel 813 driven by chain 84from a sprocket pinion 85 mounted on a screw 'conveyor shaft 86. A foamcell 88 driven by a motor 89 delivers foam through a pipe 90 through thecover 39 to a point just inside of the ring 18.

Water is introduced from a manifold 9|v through branch pipes 92 throughthe mixer cover 39. A water pipe 93 leads through the cover 39 forwashing purposes.v The various ingredients are mixed above the disc 30by pins 31 and 88 and ,l the bubble walls of the foam.`

The mixer bowl 26 is supported byslde bars 91 which in turn aresupported by horizontal table 98 of a gypsum board machine havinghorizontal frame members 99 and vertical standards |00.

When'making plaster lath, itis desirable to make a plurality, such asthree streams of board simul taneously for manufacturing economy. Threerolls of paper |02 are rotatably supported on a shaft |03 which inturnis supported in bearings |04 secured to brackets |05. Strips of paper|08 unwind from the rolls |02 and pass over the table' 98 under themixer bowl 26. Three discharge ports |08 are provided in the bowl bottom28 to discharge the mixed gypsum slurry. A slide gate |09 is providedabove each port to be swept clean by the teeth 59, each of said gates|09 having a series of discharge slots ||0 or other shaped openings. Apair of opposed slide bars are secured on the bowl bottom 26 adjacentthe port |08, each of said bars having an inwardly extending dove-tailslide ||2 which slidably receives the outer edges of gate |09 and a.reinforcing bar ||3 secured to the lower edges of said gate |09 byrivets |4. A U-shaped scraper 5 engages the lower face of each gate |09and is provided with a knife edge ||5 to scrape oil set gypsum from thebottom face of each gate |09 when said gates are manually. actuated. Anout- |99 is moved outwardly, an increasing area'of the slots ||0 iscovered by the ring 1|, and vice versa, thus controlling the volume ofslurry delivered through slots H0 to the strips of paper |06.

In operation, screw conveyor 11 moves powdered calcined gypsum from thebin to a discharge pipe 18 cleaned by scraper 19. Pipe 18 delivers thecalcined gypsum through mixer cover 39 onto high speed rotating discwhich is provided with upstanding pins 91 cooperating with stationarydownstanding pins 98 secured to the bottom of cover 39. Disc 89 isrotated from shaft l5 driven by motor 28 through pulley 23, belts 22 andpulley 2|. Foam is delivered from foam cell 88 through pipe 90 whichpasses through mixer cover 39 and delivers the foam onto upper surfaceof disc 30. Water for mixingv with the calcined gypsum is introducedthrough the mixer cover 39 through manifold 9| and branch pipes 92, thelatter being secured to the mixer cover 39 and depositing the water'ontothe uppersurface of disc 30. The various ingredients are mixed :byimpact with the rotating pins 31 and stationary pins 38, the resultingslurry being discharged through opening in ring 14 into the slow speedmixing chamber 15.

A plurality of balls 10 are mounted for rotary movement in the chamber15 and also for vertical bouncing movement caused by impact with teeth59. The teeth 69 are mounted upon a rotary plate 43 carrying an internalgear 50, said plate 43 being supported by bearings I8 and I9 near thelower end of shaft i6. Pinion 52 secured to the shaft I5 meshes withpinions 53, 54 and 55 and these pinions, in turn mesh with pinions 58,59 and 50, the latter three pinions also meshing with internal gear 50to cause the rotation of plate 49 as shaft |5 rotates.

The slurry mixed in the outer chamber 15 is discharged through threeports |08 which are provided with slide gates |09 having discharge slotsH0. Each of the gates is operated manually by levers ||8 to depositthree separate and equal streams of slurry onto the three strips ofpaper Our mixer is especially useful in that the outer mixer may beoperated without Scrapers d-ue to the bouncing and wiping action ofballs 10 on the inner surface of chamber 15. The bouncing balls alsoserve to more uniformly force the mixed slurry through the dischargeslots l0. 'I'he mixer is operated by a single motor 24 and a singledrive shaft I5 which operates both the inner high speed mixing disc 30and the outer slow speed mixing mechanism. The mixer is comparativelylow in cost and handy to operate.

We would state in conclusion that while the example illustratedconstitutes a practical embodiment of our invention, we do not wish tolimit ourselves precisely to these details, since mani' festly the samemay be considerably varied without departing-from the spirit of theinvention as defined in the appended claims.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent:

l. In a mixing device suitable for preparing gypsum slurry, a drivenshaft arranged with axis substantially vertical, a mixing disc securedto said shaft, a housing enclosing said disc, means for introducingcalcined gypsum, or the like, onto said disc to be mixed and thrownoutwardly, an annular ball chamber outside of and concentric with saiddisc to receive the slurry from said disc, resilient balls in saidchamber, a toothed wheel mounted for, rotation in said chamber, saidteeth being arranged to cause said balls to bounce and revolve in saidchamber to accomplish a further mixing of said slurry and the cleaningof the inside surface of said chamber, and means for discharging theslurry i'rom said chamber.

2. In a mixing device suitable .for preparing gypsum slurry, avertically arranged drive shaft, a mixing disc secured to said shaft, ahousing enrclosing said disc, means for depositing calcined gypsum orthe like and water onto said disc near the center of rotation thereof tobe mixed and thrown outwardly. an annular mixing element mounted forrotation concentrically about and independently of said disc, a ringgear secured to and arranged concentrically of said annular mix'- ingelement, a drive pinion secured to said shaft,

a plurality of driven pinions meshing with and equally spacedcircumferentially of said ring gear,

and a plurality of idler pinions equally spaced circumferentially ofthe.drive pinion and meshing therewith and with'said driven pinions to`cause the rotation of said annular mixing element from said shaft.

3. Ina mixing device, `a vertically arranged drive shaft, a closedannular ball chamber concentric with said shaft, said chamber beingsubfor discharging the mixed slurry from said chamg@ ber.

OLIVER M. KNODE. JOSEPH A. BESAL. FLOYD M. rI'HOltIi/iAN.

